#include<bits/stdc++.h>
using namespace std;
#include<atcoder/all>
using namespace atcoder;
#define rep(i,n) for (int i = 0; i < (n); ++i)
using ld = long double;
using ll = long long;

template<class T> bool chmax(T &a, T b)
{
	if(a<b)
	{
	a = b;
	return true;
	}
	return false;
}
template<class T> bool chmin(T &a, T b)
{
	if(a>b)
	{
		a = b;
		return true;
	}
	return false;
}

using mint = modint998244353;

int main()
{
	int K;
	cin >> K;
	string S = "NUPC";
	vector<string> v;
	rep(b,1<<4)
	{
		string T;
		rep(i,4)
		{
			T += S[i];
			if(b>>i&1) T = T+T;
		}
		v.push_back(T);
	}
	sort(v.begin(), v.end());
	cout << v[K-1] << endl;
}